# A258313 (b-file synthesized from sequence entry)
0 1
1 3
2 15
3 93
4 641
5 4719
6 36335
7 289017
8 2356321
9 19586283
10 165364799
11 1414193205
12 12224831937
13 106645825047
14 937685498271
15 8301129707121
16 73929906605249
17 661919872559763
18 5954449287679919
19 53791836313371405
20 487807821246726273
21 4438980860105747967
22 40521481906592540175